Add JMX MBean for Tomcat DataSource

If the DataSource is a Tomcat one we force it to register an MBean
if spring.jmx.enabled=true

Fixes gh-1590

spring-boot-samples/spring-boot-sample-data-jpa/src/test/java/sample/data/jpa/SampleDataJpaApplicationTests.java

@@ -1,29 +1,38 @@
 package sample.data.jpa;
 
+import static org.junit.Assert.assertEquals;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.lang.management.ManagementFactory;
+
+import javax.management.ObjectName;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.SpringApplicationConfiguration;
 import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.web.context.WebApplicationContext;
 
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-
 /**
  * Integration test to run the application.
  *
  * @author Oliver Gierke
+ * @author Dave Syer
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = SampleDataJpaApplication.class)
 @WebAppConfiguration
+// Enable JMX so we can test the MBeans (you can't do this in a properties file)
+@TestPropertySource(properties="spring.jmx.enabled:true")
 @ActiveProfiles("scratch")
 // Separate profile for web tests to avoid clashing databases
 public class SampleDataJpaApplicationTests {
@@ -44,4 +53,11 @@ public class SampleDataJpaApplicationTests {
 		this.mvc.perform(get("/")).andExpect(status().isOk())
 				.andExpect(content().string("Bath"));
 	}
+
+	@Test
+	public void testJmx() throws Exception {
+		assertEquals(1, ManagementFactory.getPlatformMBeanServer().queryMBeans(
+				new ObjectName("jpa.sample:type=ConnectionPool,*"), null).size());
+	}
+
 }